Cooling device for projector

Abstract

A cooling device for projector, comprising a light source, an exhaust fan, an air directing fan, an air duct, air inlet windows, an optical engine, a circuit board, a light cut, and a power supply to constitute a projector device with high brightness and high contrast. The projector includes a design that directs hot air flow directly into fan blades of an exhaust fan, thereby effectively reducing adverse effects and solving problems of conventional technology, such as failure to direct hot air flow into the fan blades of the exhaust fan, resulting in excessively high average temperature in the fan hub area that is in alignment with the hot air current, and high working temperature of motor bearings, control circuits, rotors and stators in the fan hub, so that the fan hub can be operating under lower temperatures, thereby enhancing normal performance, effective working life and reliability of the fan and the projector.

What is claimed is:  
     
       1. A cooling device for a projector, comprising: 
       a light source, providing light to a projector;  
       a second exhaust fan, comprising a second fan hub and a plurality of second fan blades, said second fan hub being installed at a center of the second exhaust fan, the second fan blades being respectively connected to a periphery of the second fan hub, the second fan hub controlling the second fan blades to rotate, exhausting air from the vicinity of the second fan blades inside the projector through the second fan blades to the outside of the projector; and  
       an air duct, extending at least from the light source to the second exhaust fan, exhausting air from the vicinity of the light source through the second fan blades to the outside of the projector;  
       characterized in that, the air duct is in a closed status and is positioned adjacent to a periphery of the light source to concentrate the direction of exhausted air, and the outlet of the air duct is squarely and exclusively aligned with the second fan blades.  
     
     
       2. The cooling device for projector of  claim 1 , wherein there is at least one of the air duct, each being aligned with the second fan blades. 
     
     
       3. The cooling device for projector of  claim 2 , wherein the outlet is a ring-shaped air outlet. 
     
     
       4. The cooling device for projector of  claim 1 , wherein there is a minimum distance between the air outlet and the second fan blades. 
     
     
       5. The cooling device for projector of  claim 1 , further comprising at least one light cut which is installed between the air duct and the fan blades of a first fan. 
     
     
       6. The cooling device for projector of  claim 1 , wherein an inlet of the duct comprises a third fan for air induction.